Method of making a carrier for forming wound packages



METHOD oF MAKING A CARRIER FOR FORMING woUND PACKAGES R. V. OBERRY Er ALOct. 7, 1969 original' Filed Feb. 18, 196e Enel-A125 V O'BEREYana/WILLIAM l2. SHULER BYf/vwal Jfww ATTORNEYS Oct. 7, 1969 R, V Q'BERRYETAL 3,471,350

METHOD OF MAKING A CARRIER FOR FORMING WOUND PACKAGES Original FiledFeb. 18, 1966 2 Sheets-Sheet lf/g PRESSURE- bi1-VICE G LU E APPLY! NGana. G TUBE WIN uma APPARATUS OV EN INVENTORS IC HARD O' BERRY ATTORNEY.S

United States Patent O U.S. Cl. 156-184 5 Claims ABSTRACT OF THEDISCLSURE A method of forming a carrier adapted for forming packages ofwound material wherein the carrier comprises a -convolute tube formed ofwound sheet material having a curved arcuate flap formed integraltherewith and extending from the periphery of the tube and substantiallyconforming to the curvature of the tube and being biased toward the tubeto define an entrapment zone between the flap and the tube adapted tofrictionally engage the innermost end of material wound on the carrier,and wherein the windings of the tube are adhesively secured together,with adhesive, which initially served to bond the ap against the tube toobtain the conforming ap curvature, having been rendered ineffective asby a heat treatment to provide the entrapment zone.

This application is a division of application Ser. No. 528,621, filedFeb. 128, 1966, now Patent No. 3,395,789. This invention relates to acarrier for 'forming wound packages and more particularly to a method`for making such a carrier. The carrier formed in accordance with thisinvention is so constructed as to entrap or frictionally grip theinnermost end of a length of material such as a textile fabric woundthereon for facilitating the forming of a wound package therefrom.

In accordance with this invention, the carrier is formed of a sheetmaterial such as paper wound to form a tube and having a flap securedlongitudinally of the tube and extending circumferentially along thetube, and wherein the liap is sufficiently stiff and of an arcuatenature conforming substntially to the circumferential curvature of thetube to be inherently biased inwardly toward the tube to define anentrapping zone between the iiap and the exterior surface of the tubefor frictionally gripping an end of material positioned therein whenwinding the material onto the carrier for facilitating the forming of awound package therefrom.

With the foregoing in mind, it is the primary object of this inventionto provide a method of forming such a carrier for facilitating thehandling and winding of material on the carrier in making woundpackages.

Some of the objects and advantages of this invention having been stated,others will appear as the description proceeds, when taken in connectionwith the accompanying drawings, in which:

FIGURE l is a perspective view of the carrier of this invention;

FIGURE 2 is a sectional view through the carrier of FIGURE 1, taken asindicated by the line 2 2 in FIG- URE l;

FIGURE 3 is an enlarged scale section view of a portion of the carrierof FIGURE 1, taken as indicated by the section lines in FIGURE 2;

FIGURE 4 is a perspective view of the carrier of FIGURE 1, with the ilapdisplaced from the tube;

FIGURE 5 is a perspective view of a partially formed package inaccordance with this invention, including a "ice carrier as illustratedin FIGURE 1 and a length of material being wound thereon;

FIGURE 6 is a section View through the partially formed package ofFIGURE 5, taken as indicated by the line 6 6 in FIGURE 5;

FIGURE 7 is a view similar to FIGURE 6 of a completed package inaccordance with this invention;

FIGURE 8 is a schematic showing of a portion of an apparatus forpracticing the method of this invention for making the carrier of FIGURE1;

FIGURE 9 is a schematic elevation view of a portion of ithe apparatus ofFIGURE 8, taken as indicated by the` line 9-9 in FIGURE 8;

FIGURE 10 is an elevation view, in partial section, of a portion of theapparatus illustrated in FIGURE 9, taken generally as indicated by theline 10--10l in FIG- URE 9;

'FIGURE ll is an elevation view, in partial section, of a portion of theapparatus illustrated in FIGURE 9, taken as indicated by the line 11-11in FIGURE 9;

FIGURE l2 is a perspective view of a sheet of thin flexible materialsuch as paper at an intermediate step in the method of this invention;

FIGURE 13 is a view similar to FIGURE 12, including a schematic showingof an alternate step in the method of this invention; and

FIGURE 14 is a schematic flow diagram illustration of certain steps ofthe method in accordance with this invention.

Referring now more particularly to the drawings, a package carrier orcore in accordance with this invention, generally indicated at 10, isillustrated in FIGURES 1-4. As there shown, the carrier 10 comprises atube 11 and an arcuate iiap 12 extending in circumferential andlongitudinal directions along the tube 11. The tube 11 is in the form ofa cylinder, preferably a right circular cylinder, with a cylindricalexterior surface 14, and the arcuate flap 12 is secured along alongitudinal portion of the exterior surface 14.

In order to facilitate the winding of a length of material about thecarrier 10 to form a package, as will be described in greater detailhereinafter, the ilap 12 is relatively stiff, normally disposed in acircumferentially curved position substantially conforming to thecurvature of the exterior surface 14 and adjacent thereto (FIGURE 2),and adapted to overlie the innermost or leading end of a length ofmaterial to be wound about the carrier and to cooperate therewith inaligning the first wind of material square with the tube 11 and inretaining the material during subsequent winding and handling. To thisend, the proximal opposing surfaces of the tube 11 and the flap 12,namely the cylindrical exterior surface 14 and an interior surface 15 ofthe flap, respectively, together define an entrapping zone between thesurfaces. The relative stiffness and circumferential curvature of theflap 12, obtained as a result of the method of this invention as will bedescribed in greater detail hereinafter, contribute to the cooperationof the flap 12 with a length of material to be wound about the carrier10, and render the trapping zone effective for facilitating the windingmaterial, by normally biasing the flap 12 radially inwardly toward thetube 11.

Insertion of a leading or innermost end of material, during formation ofa package using the carrier 10 of this invention as hereinafterdescribed, is facilitated by the flap 12 having a substantially linearfree edge 16. As here used with reference to the free edge 16 of the ap12, linear means that the edge 16 is not sinuous or wavy, but defines asubstantially straight line, which preferably is more or less parallelto a longitudinal line on the exterior surface 14 of the tube 11.Additionally, a minor surface area of at least one of the proximalopposing surfaces 14, 15 of the tube 11 and flap 12, such as the minorsurface area 17 of the flap 12 (FIGURE 4), has a residue of adhesivematerial thereon, which residue is ineffective to bond the opposingproximal surfaces together. The presence of the residue tends toincrease the roughness of the minor area portion on which it is present,thereby increasing the coefficient of friction of that surface portionfor aiding in holding the innermost end of material and facilitating thewinding thereof. Further, if deemed desirable, a friction increasingmaterial may form a component of the adhesive appearing in the residuethereof or may be applied to the interior surface 15 adjacent the minorsurface area 17 or to the opposing exterior surface 14 of the tube 11.Where the residue is on the interior surface 1S of the ap 12, the minorsurface area 17 extends adjacent the free edge 16.

Preferably, and in accordance with this invention, the carrier 10 isformed of a thin sheet of fibrous material such as paper or paperboard,having a thickness of from about ten points to about sixty points. Inthe paper industry, the use of points to indicate paper thicknessesrefers to thousandths of an inch so that, stated differently, thethickness of the sheet from which the carrier 10 is formed is from about0.010 inch to about 0.060 inch. For the purposes of winding materialabout the carrier 10, internal diameters of from about one inch to aboutsix inches have been found preferable. Depending upon the material to bewound about the carrier 10, the length of the carrier may range fromabout 36 inches to about 200 inches. Expressed in terms of the ratio ofthe length of the carrier 10 to the internal diameter of the carrier 10, those ratios for which the carrier of this invention finds usefulnessthus may vary Within the range of from 6:1 to 200:1. With carrierdimensions as set forth above, adequate and proper retention of materialis obtained when the circumferential extent of the flap 12 is a minimumof about 11/2 inches, and the flap preferably has a longitudinal extentsubstantially the same as the length of the tube.

Preferably, the tube 11 of the carrier 10 is formed by a plurality ofoverlying convolution windings of the thin sheet material, and thearcuate flap 12 is formed integrally with the tube 11. The arcuate flap12 is defined by the trailing end portion of the outermost or lastconvolution or winding, including the minor surface area 17, which isfree from or not bonded to the remaining convolutions of the tube 11(FIGURES 2 and 3). The major portion of the convolutions are relativelypermanently bonded together.

The package of this invention, including a carrier as described above,and the manner of forming the package may best be discussed withreference to FIGURES -7. In FIGURE 6, a package in accordance with thisinvention, generally indicated at 20, is being formed. The packageincludes a carrier 21, similar to the carrier illustrated in FIGURES 1-4and described above, and a length of material 22 being wound upon thecarrier 21 as a core. As illustrated, the material 22 represents alength of carpet material, positioned with the leading or innermost end24 of the length of carpet interposed between the fiap 25 and theexterior surface 26 of the carrier 21, so `that the flap 25 overliesthat end 24 and the end is pos1t1oned 1n the entrapping zone definedtherebetween as described above. When slightly more than one revolutionof the carrier 21 has been made during Winding (FIGURES 5 and 6), theforce necessary to proceed with winding'of the material 22 onto thecarrier 21 reinforces the frlctlonal surface contact occurring in theentrapment zone, thereby assuring adequate retention of the material 22on the carrier 21.

Further, as best shown in FIGURE 7 Where a completed package including anumber of windings of material 22 is shown, the flap 25 provides asubstantially continuous and smooth or tapering transition over theinnermost end 24 of the material 22, thereby entirely avoiding themarking which has sometimes appeared in conventional packages formedabout convolute tubes as cores.

A preferred method for making the carrier 10 of FIG- URES 1-4, inaccordance with this invention, may be briefly stated as winding a thinsheet of suitable material such a paper or paperboard into a pluralityof successive overlying convolutions, while the thin sheet has adhesiveon one surface thereof. The winding of such a thin sheet into aconvolute tube is such that the trailing end of the last or outermostconvolution includes a minor surface area of the sheet and extends in anarcuate position contiguous with the exterior surface of the lastpreceding convolution. As wound, the sheet, or at least the portion ofthe sheet including the minor surface area, contains a predeterminedquantity of moisture. Thereafter, the thus Wound sheet is treated toadhesively bond together a major portion of the convolutions.Simultaneously, the trailing end of the last convolution, including theminor surface area, is temporarily restrained in the arcuate positioncontiguous to and in intimate engagement with the last precedingconvolution and the moisture content of the sheet is reduced to stiffenthe trailing end into the arcuate form, so that the flap 12 providedthereby for the carrier 10 conforms to the curvature of the exteriorsurface of the tube and maintains the desired circumferentially curvedposition. In particular, the free edge of the trailing end portion ofthe last convolution, which is subsequently to be the free edge 16 ofthe flap 12, is temporarily restrained in a contiguous relation to theunderlying convolution throughout its longitudinal length during thetreatment, in order to assure that the free edge 16 of the carrier 10has the linear characteristics described above.

The detailed steps of the method may best be described with reference toFIGURES 8-14, wherein a glue applying and tube winding apparatus,indicated generally at 30, suitable for use in practicing the method ofthis invention has been schematically illustrated. The apparatus 30preferably may be similar to the apparatus disclosed and claimed inUnited States Patent No. 3,073,218, issued Ian. 15, 1963 to C. L.Roediger et al. and assigned to the assignee of the present invention,and a detailed description of the apparatus is not here required asreference may be made to that patent. In practicing the method of thisinvention using such an apparatus, a thin material 31 of indeterminatelength, such as paper or paperboard, is fed from a suitable source ofsupply such as a roll 32 to a glue applying and tube winding apparatus30. The material 31 is passed through a glue applying work station,generally indicated at 34, severed into appropriate lengths or sheets bya cutter means, and the sheets are supported on a work-support surfacedefined by a number of wires or cables 35 and wound in a plurality ofsuccessive convolutions about a suitable mandrel 36. Upon completion ofthe winding of a sheet of material 31 about the mandrel 36, the tubethus formed is removed from the mandrel.

In accordance with the method of the present invention, adhesives areapplied to at least portions of one surface of the material 31 at theglue applying station 34 of the apparatus 30. At that station, thematerial 31 may be passed over an idler roller 39 to reverse thedirection of the sheet (FIGURE 9), and then passed with one surface ofthe material 31 in contact with first and second glue applying rollers40, 41 rotatably supported in glue troughs, or fountains 42, 43,respectively. As the surface of the material 31 is passed in contactwith the glue applying rollers 40, 41, the rollers are caused torevolve, and apply adhesive from the fountains 42, 43, to the areas ofmaterial 31 in contact therewith. Preferably, the first and secondrollers 40, 41, respectively, are axially spaced apart (FIGURE 10), sothat a void area or zone is provided, between the areas to which glue isapplied, which is free of adhesive. The positioning of the second roller41 should be such that one edge 44 of the material 31 passes thereover.

Upon leaving the glue rollers, the material 31 is passed over anotheridler roller 45, to again reverse the direction of travel of the sheet,and through the nip of a pair of feed rollers 46, 47, to be fed onto aWork table surface as may be provided by a plurality of wires or cables35. Suitable cutter means, such as a shaft 49 supported for oscillationand carrying a cutting edge 50 thereon and an anvil 51 positioned on theopposite side of the material 31 from the cutting edge 50 maybe providedat this point to sever the material 31 into length or sheets suitablefor the longitudinal dimension or length chosen for the carrier beingmanufactured. As a severed sheet of the` material 31 is fed onto thework table surface, it may pass with the surface of the sheet oppositethe adhesive" carrying surface of the sheet in contact wih a suitablemoisture applying roller 53, rotatably supported in a water trough orfountain 54, when required and for purposes as described more fullyhereinafter.

As severed into sheets suitable for Winding by the apparatus 30, alength of the material 31 will have the appearance illustrated in FIGURE12. As there shown, the sheet 55, prepared for convolute winding into acarrier including a tube and a flap, may be seen to have a major surfacearea 56 of one surface to which adhesive has been applied by the firstglue roller 40 4from the fountain 42. Additionally, the sheet 55 has aminor surface area 57 of the one surface, to which an adhesive has beenapplied by the second glue roller 41 from the fountain 43. The major andminor surface areas 56, 57 are spaced apart to leave a void surface area58 therebetween which is free rfrom adhesive.

Preferably, the adhesive applied to the major area 56 is a first type ofadhesive, having an initial tack and subsequent bond characteristic. Bythis characteristic, it is meant that the first type of adhesive issufficiently tacky to secure the surface to which the adhesive isapplied to another surface of the sheet 55 with which it cornes incontact, during the winding operation in the apparatus 30. Further, thefirst type of adhesive, as applied to the major area portion 56, willsubsequently bond those surfaces in a substantially permanent manner.While a wide variety of adhesives or glues will have a suitable initialtack and subsequent bond characteristic, an inexpensive water solublecornstarch type of adhesive is preferred in practicing the method ofthis invention for economic reasons.

The adhesive applied to the minor area 57 is preferably a second type ofadhesive having an initial tack and latent release properties orsubsequent release characteristic. That is, the adhesive material chosenfor use as a second type of adhesive has sufficient tackiness to adheretogether the minor area 57 to a surface with which it comes in contactduring the Winding operation n the apparatus 30, and to temporarilymaintain the adhesive tack. Subsequently, the second type of adhesivematerial has its bonding effectiveness substantially reduced, or has thesame destroyed, to readily permit the release of the minor area fromadhesive restraint. A resinous type glue or adhesive which is watersoluble and substantially loses bonding effectiveness upon a reductionin moisture content, as by crystallizing, is preferred for the secondtype. One of many of these types of glues that are effective for thispurpose is that commercially available as Swift & Co. 2822 adhesive.

As may be seen in FIGURE 12, the minor surface area 57 to which thesecond type o-f adhesive is applied extends immediately adjacent oneside edge 58 of the sheet 55. The winding operation is then carried outin such a manner that the side edge 59 becomes the trailing edge of thesheet as convolute windings are formed, and the portion of the sheet Sincluding the minor area 57 subsequently defines the flap 12 of thecarrier 10 described above. Adhesively securing the edge of the trailingend portion of the outermost or last convolution and maintaining theadhesive restraint until such time that the moisture content of thesheet material has been reduced to stiften the flap defined by thatportion are particularly important where the sheet material has athickness of more than 25 points. Material of such thickness nor-mallyhas sufficient stiiness when wound, even with the necessary moisturecontent, to create a torque which would entirely unwind the convolutetube before the adhesive was set unless the edge is restrained along itsfull length longitudinally of the tube. Where a carrier `for carpet isbeing manufactured, the sheet thickness used normally is at Ileast 25points.

Due to the arrangement of the apparatus of FIGURES 8-10 as describedabove, the first type of adhesive is placed in the wide trough orfountain 42, and is applied by the first roller 40 to a portion of thesheet 31 which will become the major surface area 56 of a severed length5S of the sheet material. Similarly, a supply of the second typ'e ofadhesive is provided by the fountain 43, to be applied by the secondroller 41 to a portion of the sheet material 31 adjacent one edgethereof, which will subsequently become the minor surface area 57 of asevered length 55 of the sheet material. With the apparatus as describedabove, and the adhesive applying rollers 40', 41 being used, theapplications of adhesives to the major and minor surface areas areconcurrent.

In accordance with a modification of this invention, it is not necessarythat the adhesive applications be concurrent. More particularly, asschematically illustrated in FIGURE 13, a suitable injection nozzle =60:receiving an adhesive material suitable -for the second type from apressure device 61 may be employed to deposit a thin strip or ribbon ofadhesive material in a minor surface area 62 of a sheet 64, Such amodification may be adapted to the apparatus 30 of FIGURE 8 bypositioning the eX- trusion nozzle 60 to overlie a severed length of thesheet material 31 as the same is fed rforwardly by the Kfeed rolls 46,47 onto the Work table surface provided by the cables or wires 35'.

In order for a sheet being wound onto a convolute tube by the apparatus30 to be easily formed into convolutions and for the trailing endportion to lie properly contiguous to the exterior surface of theimmediately underlying convolution, it is necessary that the sheetmaterial 31 contain at least a predetermined quantity of moisture at thetime the windings are formed. The moisture must be suficient to permitease in winding the sheet into the tube body and flap and to insure thatthe arcuate configuration obtained for the flap will be retained upon areduction of moisture content of the paper. Under certain conditions ofambient humidity, with certain thicknesses of paper and when watersoluble adhesives are used, sufficient moisture may be present in thepaper or derived from the applications of adhesive to provide thenecessary quantity of moisture. However, under conditions of lowerambient humidity, with paper of other characteristics, when a non-watersoluble adhesive is used as the second type, or when a high solidscontent adhesive is used, the addition of moisture to at least thetrailing end portion of a length of the sheet 31 may be required inorder to obtain that predetermined quantity which will impart thedesired characteristics during winding. It is in the latter circumstancethat the application of water by the roll 53 is required.

In winding the glued or adhesive carrying sheet into a plurality ofsuccessive overlying convolutions, as by placing the side edge of asheet remote from the side edge adjacent the minor surface area againsta mandrel and rotating the mandrel t0 wind the sheet thereabout, theapparatus 30 illustrated in the drawings positions a sheet with theadhesive carrying surfaces upwardly, and winds the convolutions with theadhesive carrying surfaces directed inwardly. While this winding ispreferred, it is contemplated that the carrier of this invention mightbe wound with the adhesive carrying surfaces of a sheet facingoutwardly, by providing appropriate void areas so that the outermost orlast convolution, including the trailing end portion which is to definethe arcuate ap, would not be permanently adhesively bonded.

Subsequent to winding of a sheet to form a carrier including a tube andan arcuate fiap, the thus wound sheet is appropriately treated to setthe first type of adhesive and permanently bond a major portion of theconvolutions and to reduce the moisture content of the sheet to set thearcuate configuration of the trailing end portion. The reduction of themoisture content of the sheet, as well known in paper making and paperWorking, causes the paper sheet to stiffen or set in the position inwhich it is restrained during the process of reducing the moisturecontent. Thus, the restraint of the trailing end portion of the last oroutermost convolution in contiguous relation to the underlyingconvolution causes the trailing end portion defining the fiap tomaintain the desired circumferential curvature thereafter, with thestiffness and the curvature contributing to the desirable resultobtained with the carrier as described hereinbefore. As the moisturecontent of the sheet is being reduced, the trailing end portion,defining the flap, is restrained in the contiguous arcuate positionuntil the moisture content is reduced to such a level to set thecurvature in the flap. In particular, the edge of the trailing end isrestrained in intimate engagement with the underlying convolution, inorder to obtain the linear free edge desired for the fiap. Preferably,the restraint of the trailing end portion and the edge is an adhesiverestraint, resulting from the application of the second type of adhesiveto the minor surface area, and the adhesive tack of that surface area tothe underlying convolution.

Subsequent to the setting of the adhesive to permanently bond the majorportion of the convolutions and the reduction of moisture content to setthe arcuate curvature of the fiap, the bonding effectiveness of thesecond type of adhesive is substantially reduced or destroyed. As thesecond type of adhesive provides the adhesive restraint holding thetrailing end portion in the contiguous position, the trailing endportion or the fiap may thereafter be moved free from engagement withthe underlying convolution. Where the second type of adhesive is aresinous type of adhesive, as preferred, the crystallization of theadhesive and substantial reduction or destruction of bondingeffectiveness thereof results from the reduction in moisture present inthe sheet. The bonding effectiveness may be substantially reduced ordestroyed in other manners where other adhesives are chosen, Upon thecomplete destruction of the bonding effectiveness of a resinous typeadhesive, a residue of adhesive material remains on one of the proximalopposing surfaces which were temporarily bonded together by the adhesiveto provide the adhesive restraint.

Preferably, the treating of the thus wound tube to set the adhesive,reduce the moisture content of the sheet, and thereafter substantiallyreduce or destroy the bonding effectiveness of the second type ofadhesive includes heating the convolute wound sheet. Heating the woundsheet, by passing the sheet from the glue applying and winding apparatus30 to a tube drying oven 70 (FIGURE 14), will drive off moisture fromwater soluble adhesives to set the curvature of the convolutions andparticularly of the trailing end of the last convolution, and willcrystallize the second type of adhesive to thereafter release or permitready release of the flap. It is apparent, however, that other methodsof treatment such as air drying may be appropriate where timeconsiderations and ambient con* ditions permit.

It is thus seen that a novel method of forming a carrier has beendisclosed wherein the stiffness of the carrier flap and the arcuatenature thereof bias the flap toward the tube for defining therebetween africtionally entrapping zone for engaging an end of material positionedtherein and for facilitating starting the first wind of material squarewith the tube axis and the winding of the remainder of the material onthe carrier in forming a wound package.

In the drawings and specification there has been set forth a preferredembodiment of the invention and, although specific terms are employed,they are used in a generic and descriptive sense only and not forpurposes of limitation.

We claim:

1. A method of making a carrier adapted to be used as a core for woundmaterial, said carrier comprising a tube and a relatively stiff inwardlybiased arcuate flap longitudinally secured thereto and extendingcircumferentially thereof, said fiap being adaptable to overlie andsecure the innermost end of a length of material wound onto the carrierfor facilitating the winding of the material thereon, said methodcomprising winding into a plurality of successive overlying convolutionsa relatively thin sheet of fibrous material containing a predeterminedquantity of moisture therein, while adhesively bonding together thesuccessive convolutions in the tube-forming portions of the sheet by anadhesive of one characteristic and while adhesively bonding the trailingend arcuate flap forming portion of the sheet to the underlyingconvolution by an adhesive of another characteristic having latentrelease properties, and drying the thus wound sheet to reduce themoisture content in the wound sheet to impart stiffness and an inwardbias to the flap while setting the adhesive on the tube forming portionsand while rendering ineffective the bonding characteristics of theadhesive on the flap whereby the trailing end of the flap will readilyseparate from the tube.

2. A method of making a carrier adapted to be used as a core for woundmaterial, said carrier comprising a tube and a relatively stiff inwardlyybiased arcuate flap longitudinally secured thereto and extendingcircumferentially thereof, said flap being adaptable to overlie andsecure the innermost end of a length of material wound onto the carrierfor facilitating the winding of the material thereon, said methodcomprising applying first and second types of glue to major and minorsurface areas, respectively, of one surface of a relatively thin sheetof fibrous material containing a predetermined quantity of moisturetherein, with the second type of glue having latent release properties,

winding the glued sheet into a plurality of successive overlyingconvolutions to form a tube with the trailing end of the lastconvolution of the sheet including the minor area thereof defining atrailing arcuate flap positioned contiguous to the exterior of the lastpreceding convolution, and

heating the thus wound sheet to reduce the moisture content to apredetermined level to impart stiffness to the tube and to the arcuateflap while setting the first type of glue for bonding the tube and whilerendering ineffective the bonding characteristics of the second type ofglue whereby the trailing end of the flap will readily separate from thetube.

3. A method according to claim 2 wherein the glue is applied uniformlyover the major and minor areas of the sheet while a void area free ofglue is formed separating the major and minor areas and with the glue inthe minor area extending along and adjacent the edge of the trailing endof the sheet to serve for restraining the edge in a linear positionagainst the underlying convolution until the heating destroys thebonding effectivness thereof.

4. A method according to 3 wherein the combined circumferential lengthof the void area and minor area is at least about 11/2 inches.

5. A method of making a carrier adapted to be used as a core for woundmaterial, said carrier comprising a tube and a relatively stiff inwardlybiased arcuate ap longitudinally secured thereto and extendingcircumferentally thereof, said fiap being adaptable to overlie andsecure the innermost end of a length of material wound onto the carrierfor facilitating the winding of the material thereon, said methodcomprising feeding a predetermined length of relatively thin weblikefibrous material from a roll in a predetermined path of travel, whileapplying a first type of glue to a major area of one surface portion ofthe predetermined length of material and while applying a second type ofglue having latent release properties to an adjacent minor area thereof,

while applying a predetermined amount of moisture to at least the minorarea portion of the material to raise the moisture content thereof to apredetermined level,

severing the predetermined length of material to form a sheet,

winding the sheet into a plurality of successive overlying convolutionsto form a tube with the trailing end of the last convolution of thesheet including the minor area and defining a trailing arcuate flapcontiguous to the exterior surface of the last preceding convolution,and

heating the thus wound sheet to reduce the moisture content to apredetermined level to impart stiffness and inward bias to the arcuateap while setting the first type of glue for bonding the tube whilerendering ineffective the bonding characteristics of the second type ofglue whereby the trailing end of the fiap will readily separate from thetube.

References Cited UNITED STATES PATENTS EARL M. BERGERT, Primary ExaminerI. C. GIL, Assistant Examiner U.S. Cl. XR.

